1. University of California San Diego, School of Medicine, 9500 Gilman Drive, La Jolla, San Diego, CA 92093, USA
2. Department of Radiology & Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, M-391, San Francisco, CA 94143, USA
3. Department of Surgery, University of California San Diego, 9500 Gilman Drive, San Diego, CA 92093, USA
4. Division of Trauma, Surgical Critical Care and Burns, University of California, San Diego School of Medicine, 9500 Gilman Drive, San Diego, CA 92093, USA